Kyanite, also known as kyanite, is an aluminum silicate. The name derives from the Greek word "kyanos", deep blue, which is the color of kyanite crystals. In ancient times it was known by the term distene, from the Greek “dis” “two” and “stenos” “strength”, to indicate its singular characteristic: the hardness of the crystal varies according to the directions of the scratch. Kyanite constitutes together with andalusite and sillimanite the three polymorphic forms of Al2SiO5, of which kyanite is the high pressure member. The presence of these polymorphic forms is used to characterize metamorphic rocks.
Dimensions
Height (cm): 7.5
Depth (cm): 5
Width (cm): 19
Weight (g): 1033
Property
Chemical Formula: Al2 (SiO5)
Mohs scale: 4-4.5
Relative density: 3.53-3.67
Crystalline System: Triclino
